Kanardia miniDaqu, Руководство пользователя, Страница: 26 / 53

5. RPM Signal miniDaqu — Manual
3. Select the Engine icon.
4. On the Daqu switch function line select the Alarm light option.
Figure 14: Illustration of Alarm light function activation on Nesis and Aetos.
5 RPM Signal
This section gives installation details for RPM output signal. Most engines
with ECU transmit the engine RPM value over digital communication bus
(CAN bus, RS-232). This works well with Kanardia instruments. However,
some third party instruments may require classical RPM signal as it was
created on engines without ECU in order to operate properly. Daqu can solve
this problem.
Daqu reads the engine RPM value from ECU and creates digital pulses on
the pins 5 and 9 of the Kanardia CAN bus connector. See Figure 3 and Table
2 . It creates one digital pulse per RPM. Third party instrument can connect
to these pins and detect pulses in order to obtain RPMs.
5.1 Connection
Inside Daqu, an opto-isolator is used. Collector is routed directly to RPM
out+ pin and emiter is routed directly to RPM out- pin. This allows different
connection schematics. The most often used one is given on Figure 15.
Here some positive voltage V must be connected via a 10kΩ resistor to the
RPM + pin and RPM - pin must be grounded externaly. A rectangular signal
appears between the pins. The signal will oscillate between GND and supplied
voltage
V .
5.2 Configuration
No special software configuration is required. By default the RPM-out signal
is 1 pulse per rotation with a 50% duty cycle.
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